Mandrel for honing machines



0. F. STAPLE? MANDREL FOR HONING MACHINES Dec. 7 1943.

Filed Feb. 7, 1942 uvvzzvrox. CHARLES ESTAPLES BY a 1 i ATTORNEY klflllll llllllllllllll lllllllllnllll lllllllll Fatented Dec. 7, 1943 UNITEDSTATES PATENT OFFICE MANDREL FOR HONING MACHINES Charles F. Staples,Birmingham, Mich.

Application February '7, 1942, Serial No. 429,849

2 Claims.

The present invention relates to mandrels for grinding or honingmachines and particularly for mandrels in which the abrasive stones areadjustable readily.

Among the objects of the invention is a mandrel which has a longer lifethan some of those now in use in that substantially all of the wear isconfined to the abrasive stones.

Another object is a mandrel adaptable for small holes but which hasrelatively large abrasive surfaces.

Another object is a mandrel which shall be economical to produce andsimple to operate, and one which will maintain its concentricity.

Still other objects and advantages will be apparent to those skilled inthe art upon reference to the following description and the accompanyingdrawing in which Figure l is a side elevation of the mandrel.

Figure 2 is a plan view thereof.

Figure 3 is an end elevation.

Figure 4 is a section on line 4-4 of Figure 1, and

Figure 5 is a View in elevation of a stone holder.

In the drawing, the mandrel is shown as made up of a sleeve Ill providedwith a slot II at its rear by means of which the sleeve may be rotatedin a suitable machine. The sleeve l serves to support in slidablerelation a shaft or rod I2 forming the mandrel proper, the movement ofthe shaft being accomplished through the agency of suitable means, suchas the hook l3, fixed in or to the rear end of the shaft as by a screwl3a, or by welding or riveting.

At its forward end, the shaft I2 is milled, as

shown, in diagonally opposite-quarters to provide arallel sloping camsurfaces l and [5a at the bottom of the out, those in one quarter beinarranged in opposed relation to those in the other, while the side It ofthe cut is somewhat beyond the vertical center line I! and extends tothe peripheral circle of the shaft, serving as a lateral and drivingsupport for the abrasive stones. This permits the cutting in therearward portion of the shaft of diametrically opposite grooves I8extending rearwardly a suitable distance within the sleeve Hi, thelatter being provided with radial slots is of the same width as andadapted to register with said grooves.

Seated in the grooves I8 and upon the cams l5 and ifia, is a pair ofstone holders, such as is shown in Figure 5, each consisting of a shoeportion 25 having cemented or otherwise secured to its upper surface anabrasive stone 25 and having its bottom face provided with slopingsurfaces 21 and 21a conforming to and adapted to coact with the surfacesI5 and 1511 on the shaft l2, to move the stones radially of the shaftwhen the latter and the stoneholders are moved relativelylongitudinally.

Each of the stoneholders is provided with a rearward extension 30slidably fitting in a groove 18 and having at its end an upwardlyextending portion 3|.

This portion 3| of the stoneholder is arranged to fit snugly within aslot IQ of the sleeve I0, and held therein against movement by means ofa screw 32, thus serving to prevent relative rotation of sleeve I0 andshaft l2.

In the use of th device, relative longitudinal movement of the sleeve l0and shaft l2 will of course produce radial movement of the stones 26.

I am aware that the invention may be embodied in other specific formswithout departing from the spirit or essential attributes thereof, and Itherefore desire the present embodiment to be considered in all respectsas illustrative and not restrictive; reference being had to the appendedclaims rather than to the foregoing description to indicate the scope ofth invention.

I claim:

1. A honing mandrel for honing machines consisting of a sleeve, a shaftslidable longitudinally in said sleeve, said shaft having diametricallyopposed quarters thereof cut out to provide notches each having one wallparallel to a radius of the shaft and having its other wall providedwith a plurality of cam surfaces extending longitudinally thereof, and apair of stone holders each provided with cam surfaces adapted to coactwith the first mentioned cam surfaces, said holders having abrasivestones mounted thereon, means to fix the relative longitudinal positionof said sleeve and holders.

2. A honing mandrel for honing machines consisting of a sleeve, a shaftslidable longitudinally in said sleeve, said shaft having diametricallyopposed quarters thereof cut out to provide notches each having one wallparallel to a radius of the shaft and having its other wall providedwith a plurality of cam surfaces extending longitudinally thereof, and apair of abrasive carrying elements each provided with cam surfacesadapted to coact with the first mentioned cam surfaces, means to fix therelative longitudinal position of said sleeve elements.

. CHARLES F. STAPLES.

